Hey fella's,
I did a quick search, most of which came back as year or more old.

Anyways, I got CEL today for first time. Its the P0401 "EGR insuff flow" and the P1000- which I believe to be a non-issue.
I cleared codes, came back few mins later, deleted again and returned on next startup 10mins later.
What is the best solution to this and what have you guys who got teh code do?
-Load a stock or near stock tune to let egr valve function,
-deal with cel and/or keep clearing codes,
-or can I without losing coolant remove and clean myself?
-?

(I have the spartan dashdaq, dpf delete and been running the 210/275 and just few days ago the 250, latest updates)

I had the same issue. Spartan said it was a flaw in the 250 tune and to switch to any other tune until they resolve it

REALLY, because I just called their Tech line today asking when the fix might be out and they told me " I've never heard of that with the 250 tune, that's only been a 210 tune issue". I have the exact same problem , loaded up the the new "updated tunes" , (250 tune in this case) and have driven the truck four times, and four times I've gotten the 401 code. I'll try shifting down to a tune lower than 210 and see what happens. Has anyone else actually called/ emailed them about thise issue with the 250 tune before???

Ive used the 210 primarily and never had a code, I tried the 275 for a couple weeks-all good. Tried the 250 and got the code almost immediately, delete it, keeps coming back. Loaded the 210 back and havent an issue.

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